XR650L Fuel injection might be possible, and easy...


64 replies to this topic
  • Captain Midnight

Posted March 07, 2008 - 05:23 PM

#61

Were the teeth cut into the flywheel, or is that a ring that was fitted?

  • stepho

Posted March 08, 2008 - 08:30 AM

#62

capt. were you talking to me.
well if you were, we did shrink a ring onto the flywheel. We then put the flywheel on the 4th axis of an cnc machine and rotated the wheel and cut the tooth accordingly. We are still finding out more and more stuff about this fi. All along we have had hard times starting these bikes consistantly. The slow turning cranking speed is a factor with the minimum ECU requirements. to fix this we instaled a ford starter soleniod which makes the bike turn over much faster. Also the voltage drop that is caused at starting. this brings the voltage drop down below the minimum ecu reqirements. I have been talking about another FI company about outfitting some of our vtwin bikes and they have sprouted ideas. We are thinking of getting rid of the 36-1 and going with a 8 evenly spaced tooth with a cam sensor trigering the final tooth before it hits tdc. What this does is update the ecu faster. the delay in between the teeth along with the syncing of the cam sensor will allow it to up date the ecu 8 times per revolution to just one time per revouliton. if we try this we will change to a hall sensor.

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  • HeadTrauma

Posted March 08, 2008 - 09:52 AM

#63

The dual wheel setup is what Honda uses on the F4i, except I think the crank wheel has 12 teeth instead of 8. I imagine they need to make efficient use of the processor when accurately fueling and firing(with COP no less) a 15,000rpm engine. Some Mazdas and other Asian cars come that way also. It will be interesting to see how it works for you on a single cylinder thumper.

  • Captain Midnight

Posted March 08, 2008 - 02:03 PM

#64

capt. were you talking to me.
well if you were, we did shrink a ring onto the flywheel. We then put the flywheel on the 4th axis of an cnc machine and rotated the wheel and cut the tooth accordingly. We are still finding out more and more stuff about this fi. All along we have had hard times starting these bikes consistantly. The slow turning cranking speed is a factor with the minimum ECU requirements. to fix this we instaled a ford starter soleniod which makes the bike turn over much faster. Also the voltage drop that is caused at starting. this brings the voltage drop down below the minimum ecu reqirements. I have been talking about another FI company about outfitting some of our vtwin bikes and they have sprouted ideas. We are thinking of getting rid of the 36-1 and going with a 8 evenly spaced tooth with a cam sensor trigering the final tooth before it hits tdc. What this does is update the ecu faster. the delay in between the teeth along with the syncing of the cam sensor will allow it to up date the ecu 8 times per revolution to just one time per revouliton. if we try this we will change to a hall sensor.


Won't 36 teeth give more accurate timing? Leave the 36 and add cam trigger.

  • xrltim

Posted March 09, 2008 - 09:09 AM

#65

I regularly see Dan Gurney on the Ortega Hwy. here in SoCal on his Alligator streetbike which is powered by a 650L motor. In fact he has a whole fleet of them. There are different carb and pipe configs one of which is injected. It's pretty trick, probably making 75 HP. The coolest is the dual flat slide Mikuni setup.These probably work great on the street but throw some dirt, mud and big bumps and there will be issues.





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